The news outlet reported that federal prosecutors have interviewed witnesses about how the Ukrainians gained access to inaugural events and what they discussed during meetings while in the U.S.

At least a dozen Ukrainians attended the inauguration, including several who were at the official Liberty Ball, The Times reported. The officials also stopped by the Trump International Hotel and brushed with congressional Republicans and Trump allies, the news outlet said.

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Investigators are reportedly looking into evidence that at least some of the Ukrainians held agendas that aligned with Russian interests, including some who sought to ease sanctions on Moscow and pitch a peace plan between Russia and the Ukraine.

The Times reported that investigators have also inquired about whether Ukrainians and other foreigners disguised donations to the Trump inaugural committee. It is illegal for foreigners to donate to such committees.

Manafort began working for the Trump campaign in March 2016 before he was forced to resign that August following revelations about his lobbying work on behalf of pro-Russian forces in Ukraine. He was convicted of bank and tax fraud in a trial last year.

Trump has drawn scrutiny at times for his rhetoric toward Russia and its president, Vladimir Putin. He has at times cast doubt on the U.S. intelligence committee's conclusion that Russia interfered in the 2016 election, and has called for closer ties between the two countries.

The Trump inaugural committee is reportedly under scrutiny over whether it misspent funds or accepted donations in exchange for access to the administration.